di is a disk information utility, displaying everything that df does and more. It features the ability to display your disk usage in whatever format you desire/prefer/are used to. It is designed to be highly portable across many platforms.

di Displays usage information on mounted filesystems. Block values are reported in a human readable format. If the user or group has a disk quota, the values reported are adjusted according the quotas that apply to the user.
If file is specified, the usage information for the partition on which file is located is printed.